mozy contest: problem 6 PHP solution

[Nicholas Leippe]

The 6th problem was to simply rot1 all alphabet characters in the input.

<?

while ($line = fgets(STDIN)) {
        $line = trim($line);
        for ($i = 0; $i < strlen($line); $i++) {
                $c = $line{$i};
                if ($c == ' ') {
                        echo $c;
                        continue;
                }
                if (strtolower($c) == $c) {
                        $base = 'a';
                } else {
                        $base = 'A';
                }
                echo chr(((ord($c) - ord($base) + 1) % 26) + ord($base));
        }
        echo "\n";
}